The bulk update request #11116 is pending approval.

create implication muffled_speech (582) -> muffled (4193)
create implication muffled_screaming (278) -> muffled (4193)
create implication muffled_moaning (216) -> muffled (4193)
create implication muffled_sounds (23) -> muffled (4193)
create alias muffled_scream (42) -> muffled_screaming (278)

Reason: All these categories can be gathered under "muffled".